/*---------------------------------------------------------------------------*
  Project:  NitroSDK - GX - demos - UnitTours/2D_CharBg_5
  File:     main.c

  Copyright 2003,2004 Nintendo.  All rights reserved.

  These coded instructions, statements, and computer programs contain
  proprietary information of Nintendo of America Inc. and/or Nintendo
  Company Ltd., and are protected by Federal copyright law.  They may
  not be disclosed to third parties or copied or duplicated in any form,
  in whole or in part, without the prior written consent of Nintendo.

  $Log: main.c,v $
  Revision 1.22  2004/11/02 09:34:54  takano_makoto
  fix typo.

  Revision 1.21  2004/05/24 10:29:42  takano_makoto
  fixed autotest code

  Revision 1.20  2004/04/07 01:23:27  yada
  fixed header comment

  Revision 1.19  2004/04/06 12:48:06  yada
  fixed header comment

  Revision 1.18  2004/02/24 05:25:21  yasu
  used OS_EnableIrqMask instead of OS_SetIrqMask

  Revision 1.17  2004/02/09 01:44:47  kitani_toshikazu
  added default setting codes for auto testing.

  Revision 1.16  2004/02/05 07:09:02  yasu
  changed SDK prefix iris -> nitro

  Revision 1.15  2004/02/05 01:15:24  kitani_toshikazu
  added codes for autoTesing.

  Revision 1.14  2004/01/19 02:15:56  nishida_kenji
  fixed comments

  Revision 1.13  2004/01/18 09:20:26  nishida_kenji
  added DEMOStartDisplay

  Revision 1.12  2004/01/18 07:12:43  nishida_kenji
  changed the place of SVC_WaitVBlankIntr

  Revision 1.11  2004/01/09 12:02:34  nishida_kenji
  used OS_SetIrqCheckFlag at VBlankIntr()

  Revision 1.10  2004/01/07 09:38:05  nishida_kenji
  revised comments

  Revision 1.9  2003/12/25 11:00:09  nishida_kenji
  converted by GX_APIChangeFrom031212-2.pl

  Revision 1.8  2003/12/17 11:35:17  nishida_kenji
  used DC_FlushRange

  Revision 1.7  2003/12/17 09:00:20  nishida_kenji
  Totally revised APIs.
  build/buildtools/GX_APIChangeFrom031212.pl would help you change your program to some extent.
  $NoKeywords: $
 *---------------------------------------------------------------------------*/

//---------------------------------------------------------------------------
// A sample that flips all characters on the screen horizontally/vertically:
//
// USAGE:
//   A: Flips horizontally
//   B: Flips vertically
//
// HOWTO:
// 1. Set up the character/palette/screen data same as 2D_CharBG_1.
// 2. Set up horizontal/vertical flip bits of the screen data.
//---------------------------------------------------------------------------

#include <nitro.h>
#include "DEMO.h"
#include "data.h"

static u16 sScrnBuf[SCREEN_SIZE];                          // Buffer for screen data(BG #0)

void NitroMain(void)
{
    //---------------------------------------------------------------------------
    // Initialize:
    // They enable IRQ interrupts, initialize VRAM, and set BG #0 for text mode.
    //---------------------------------------------------------------------------
    DEMOInitCommon();
    DEMOInitVRAM();
    DEMOInitDisplayBG0Only();

    //---------------------------------------------------------------------------
    // Transmitting the character data and the palette data
    //---------------------------------------------------------------------------
    GX_LoadBG0Char(d_64_256_bg_schDT, 0, sizeof(d_64_256_bg_schDT));
    GX_LoadBGPltt(d_64_256_bg_sclDT, 0, sizeof(d_64_256_bg_sclDT));

    DEMOStartDisplay();
    //---------------------------------------------------------------------------
    // Main Loop
    //---------------------------------------------------------------------------
    while (1)
    {
        int flip_H = 0, flip_V = 0;
        int i, j;

        DEMOReadKey();

        if (DEMO_IS_PRESS(PAD_BUTTON_A))
            flip_H = 1;
        if (DEMO_IS_PRESS(PAD_BUTTON_B))
            flip_V = 1;
        
        #ifdef SDK_AUTOTEST
        flip_H = 1; flip_V = 1;// default params for testing.
        GX_SetBankForLCDC( GX_VRAM_LCDC_C );
        EXT_TestSetVRAMForScreenShot( GX_VRAM_LCDC_C );
        EXT_TestScreenShot( 100, 0xC776DFB4 );
        EXT_TestTickCounter();
        #endif //SDK_AUTOTEST
        
        for (i = 0; i < 8; i++)
        {
            for (j = 0; j < 8; j++)
            {
                sScrnBuf[(i * 32) + j] = (u16) (flip_V << 11 | flip_H << 10 | ((i * 0x10) + j));
            }
        }
        // Store the data onto the main memory, and invalidate the cache.
        DC_FlushRange(sScrnBuf, sizeof(sScrnBuf));
        
        
        SVC_WaitVBlankIntr();                              // Waiting for the end of V-Blank interrupt

        GX_LoadBG0Scr(sScrnBuf, 0, sizeof(sScrnBuf));
    }
}

//---------------------------------------------------------------------------
// V-Blank interrupt function:
//
// Interrupt handlers are registered on the interrupt table by OS_SetIRQFunction.
// OS_EnableIrqMask selects IRQ interrupts to enable, and
// OS_EnableIrq enables IRQ interrupts.
// Notice that you have to call 'OS_SetIrqCheckFlag' to check a V-Blank interrupt.
//---------------------------------------------------------------------------
void VBlankIntr(void)
{
    OS_SetIrqCheckFlag( OS_IE_V_BLANK );                   // checking V-Blank interrupt
}
